如何价值型，空值类型，枚举，可为空，枚举，引用类型通过反射区分？ [英] How to differentiate between value-type, nullable value-type, enum, nullable-enum, reference-types through reflection?

问题描述

如何价值型，可为空值类型，枚举，可为空，枚举区分，引用类型通过反射？

 枚举MyEnum 
 {
一，
两组，
三
} 
 
类MyClass的
 {
公众诠释IntegerProp {搞定;组; } 
公众诠释？ NullableIntegerProp {搞定;组; } 
公共MyEnum EnumProp {搞定;组; } 
公共MyEnum？ NullableEnumProp {搞定;组; } 
公共MyClass的ReferenceProp {搞定;组; } 
} 
 
类节目
 {
静态无效的主要（字串[] args）
 {
串propOne =IntegerProp; 
串propTwo =NullableIntegerProp; 
串propThree =EnumProp; 
串propFour =NullableEnumProp; 
串propFive =ReferenceProp; 
 
型classType所= typeof运算（MyClass的）; 
 
的PropertyInfo propInfoOne = classType.GetProperty（propOne）; 
的PropertyInfo propInfoTwo = classType.GetProperty（propTwo）; 
的PropertyInfo propInfoThree = classType.GetProperty（propThree）; 
的PropertyInfo propInfoFour = classType.GetProperty（propFour）; 
的PropertyInfo propInfoFive = classType.GetProperty（propFive）; 
 
 propInfoOne ??? 
 ............... 
 ............... 
} 
} 
  

凡在propInfo ... S这些信息能够被检索？

< DIV CLASS =h2_lin>解决方案

下面是你如何检查枚举，可为空，primitve和值类型;

  Console.WriteLine（propInfoOne.PropertyType.IsPrimitive）; //真
 Console.WriteLine（propInfoOne.PropertyType.IsValueType）; //假的，值类型结构
 
 Console.WriteLine（propInfoThree.PropertyType.IsEnum）; //真
 
 VAR nullableType = typeof运算（可空<>）。MakeGenericType（propInfoThree.PropertyType）; 
 Console.WriteLine（nullableType.IsAssignableFrom（propInfoThree.PropertyType））; //真
  

请注意值类型和原始类型是不同的东西。原语是简单的映射到类型（例如，布尔> System.Boolean）速记。值类型是按值传递;他们是结构（URE）不是类。

How to differentiate between value-type, nullable value-type, enum, nullable-enum, reference-types through reflection?

enum MyEnum
    {
        One,
        Two,
        Three
    }

    class MyClass
    {
        public int IntegerProp { get; set; }
        public int? NullableIntegerProp { get; set; }
        public MyEnum EnumProp { get; set; }
        public MyEnum? NullableEnumProp { get; set; }
        public MyClass ReferenceProp { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            string propOne = "IntegerProp";
            string propTwo = "NullableIntegerProp";
            string propThree = "EnumProp";
            string propFour = "NullableEnumProp";
            string propFive = "ReferenceProp";

            Type classType = typeof(MyClass);

            PropertyInfo propInfoOne = classType.GetProperty(propOne);
            PropertyInfo propInfoTwo = classType.GetProperty(propTwo);
            PropertyInfo propInfoThree = classType.GetProperty(propThree);
            PropertyInfo propInfoFour = classType.GetProperty(propFour);
            PropertyInfo propInfoFive = classType.GetProperty(propFive);

            propInfoOne.???
            ...............
            ...............
        }
    }

Where in the propInfo...s these information can be retrieved?

解决方案

Here is how you check for enum, nullable, primitve and value types;

Console.WriteLine(propInfoOne.PropertyType.IsPrimitive); //true
Console.WriteLine(propInfoOne.PropertyType.IsValueType); //false, value types are structs

Console.WriteLine(propInfoThree.PropertyType.IsEnum); //true

var nullableType = typeof (Nullable<>).MakeGenericType(propInfoThree.PropertyType);
Console.WriteLine(nullableType.IsAssignableFrom(propInfoThree.PropertyType)); //true

Note that value types and primitives are different things. Primitives are simply shorthands that map to types (e.g bool > System.Boolean). Value types are passed by value; they are struct(ure)s not classes.

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